You can come back any time to complete an ongoing evaluation or survey. Your results are saved continuously as you progress.
You can exit the survey at any time (via the user icon in the top right) and resume later from where you left off.
Log in to your account to continue or check your inbox for the "Resume evaluation" email if you participated through a one-time secure link.
A skills matrix however will not be saved unless you click the "Save" button at the bottom of the page.